Fastest time to mentally divide ten 10-digit numbers by five-digit numbers
Who
Hakan Gurbaslar
Where
Turkey (Ankara)
When

The fastest time to mentally divide ten 10-digit numbers by five-digit numbers is 2 min 49 sec, and was achieved by Hakan Gurbaslar (Turkey) at the Brain Awareness Week event at Neva Palas Hotel, Ankara, Turkey, on 21 March 2015.

The attempt was overseen by arbiters from the Memoriad organisation, who host mental mathematics and memory competitions and events.